MEXICO CITY, Mexico (CNN) -- The driver of the bus that collided with a tractor-trailer in Mexico, killing him and 11 tourists, had more than 20 years of experience, the bus service operator said Wednesday.

Emergency workers wheel a crash victim on a gurney after Monday's bus crash in Mexico.

The 21-year-old driver of the truck, who was hospitalized, was intoxicated, said Segismundo Doguin Martinez, a police official in the Mexican state of Coahuila, on Tuesday.

Grupo Senda, which operated the Senda Express bus, said in a statement that police reports show the truck driver crossed the median and hit the bus head-on Monday afternoon. The crash occurred near Monterrey, on the road between Saltillo and Zacatecas.

The bus was traveling from McAllen, Texas, to Zacatecas in central Mexico. The company identified the bus driver as Cesar Garcia Huerta. Fifteen people were injured.

"Our bus driver and our bus were in perfect operational condition and totally complying with our strict safety and maintenance standards. Grupo Senda is a company that runs more than 320 million kilometers [200 million miles] per year," the company said in a written statement.

"Also our company is in compliance with all necessary Mexican federal rules and regulations as with all insurance requirements."

The company said the driver was also properly certified for that kind of charter service.

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Grupo Senda said it was working with families of the deceased and was paying for transporting bodies to their hometowns. The company also is paying for all hospital and medical bills, it said, and is cooperating in the investigation of the crash in northeast Mexico.

"Grupo Senda wishes to express its most sincere condolences to the families of the victims of this terrible accident," the company said.